<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card class="box-card">
      <!-- 警告区域 -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning"
        :closable="false"
      >
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="catelist"
            ref="cascaderRef"
            :props="{ expandTrigger: 'hover', ...cateProps }"
            @change="handleChange"
          ></el-cascader>
          <!-- tab页签区域 -->
          <el-tabs v-model="activeName" @tab-click="handleClick">
            <!-- 添加参数的面板 -->
            <el-tab-pane label="动态参数" name="many">
              <!-- 添加参数的按钮 -->
              <el-button
                type="primary"
                :disabled="isBtnDisabled"
                @click="addDialogVisible = true"
                >添加参数</el-button
              >
              <!-- 动态参数表格 -->
              <el-table :data="manyTableData" border stripe>
                <!-- 展开行 -->
                <el-table-column type="expand">
                  <template slot-scope="scope">
                    <!-- 循环渲染Tag标签 -->
                    <el-tag
                      v-for="(item, i) in scope.row.attr_vals"
                      :key="i"
                      closable
                      @close="handleClose(i, scope.row)"
                      >{{ item }}</el-tag
                    >
                    <!-- 输入的文本框 -->
                    <el-input
                      class="input-new-tag"
                      v-if="scope.row.inputVisible"
                      v-model="scope.row.inputValue"
                      ref="saveTagInput"
                      size="small"
                      @keyup.enter.native="handleInputConfirm(scope.row)"
                      @blur="handleInputConfirm(scope.row)"
                    >
                    </el-input>
                    <!-- 添加按钮 -->
                    <el-button
                      v-else
                      class="button-new-tag"
                      size="small"
                      @click="showInput(scope.row)"
                      >+ New Tag</el-button
                    >
                  </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index" label="#"> </el-table-column>
                <el-table-column prop="attr_name" label="参数名称">
                </el-table-column>
                <el-table-column label="操作">
                  <template slot-scope="scope">
                    <el-button
                      type="primary"
                      icon="el-icon-edit"
                      size="mini"
                      @click="showEditDialog(scope.row.attr_id)"
                      >编辑</el-button
                    >
                    <el-button
                      type="danger"
                      icon="el-icon-delete"
                      size="mini"
                      @click="removeParams(scope.row.attr_id)"
                      >删除</el-button
                    >
                  </template>
                </el-table-column>
              </el-table>
            </el-tab-pane>
            <el-tab-pane label="静态属性" name="only">
              <!-- 添加属性的按钮 -->
              <el-button
                type="primary"
                :disabled="isBtnDisabled"
                @click="addDialogVisible = true"
                >添加属性</el-button
              >
              <!-- 静态参数表格 -->
              <el-table :data="onlyTableData" border stripe>
                <!-- 展开行 -->
                <el-table-column type="expand">
                  <template slot-scope="scope">
                    <el-tag
                      v-for="(item, i) in scope.row.attr_vals"
                      :key="i"
                      closable
                      @close="handleClose(i, scope.row)"
                      >{{ item }}</el-tag
                    >
                    <!-- 输入的文本框 -->
                    <el-input
                      class="input-new-tag"
                      v-if="scope.row.inputVisible"
                      v-model="scope.row.inputValue"
                      ref="saveTagInput"
                      size="small"
                      @keyup.enter.native="handleInputConfirm(scope.row)"
                      @blur="handleInputConfirm(scope.row)"
                    >
                    </el-input>
                    <!-- 添加按钮 -->
                    <el-button
                      v-else
                      class="button-new-tag"
                      size="small"
                      @click="showInput(scope.row)"
                      >+ New Tag</el-button
                    >
                  </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index" label="#"> </el-table-column>
                <el-table-column prop="attr_name" label="属性名称">
                </el-table-column>
                <el-table-column label="操作">
                  <template slot-scope="scope">
                    <el-button
                      type="primary"
                      icon="el-icon-edit"
                      size="mini"
                      @click="showEditDialog(scope.row.attr_id)"
                      >编辑</el-button
                    >
                    <el-button
                      type="danger"
                      icon="el-icon-delete"
                      size="mini"
                      @click="removeParams(scope.row.attr_id)"
                      >删除</el-button
                    >
                  </template>
                </el-table-column>
              </el-table>
            </el-tab-pane>
          </el-tabs>
        </el-col>
      </el-row>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 添加参数的对话框 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        class="demo-ruleForm"
      >
        <!-- 添加参数的对话框 -->
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <!-- 添加参数的对话框 -->
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
        class="demo-ruleForm"
      >
        <!-- 添加参数的对话框 -->
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'Params',
  data() {
    return {
      catelist: [], //商品分类列表
      cateProps: {
        //级联选择框的配置对象
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
      },
      selectedCateKeys: [],
      activeName: 'many', // 被激活的页签的名称
      manyTableData: [], // 动态参数的数据
      onlyTableData: [], // 静态属性的数据
      addDialogVisible: false, //控制添加对话框的显示与隐藏
      addForm: {
        // 添加参数的表单数据对象
        attr_name: '',
      },
      addFormRules: {
        // 添加表单的验证规则对象
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' },
        ],
      },
      editDialogVisible: false, //控制添加对话框的显示与隐藏
      editForm: {
        // 添加参数的表单数据对象
        attr_name: '',
      },
      editFormRules: {
        // 添加表单的验证规则对象
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' },
        ],
      },
      // 控制按钮与文本框的切换显示
      inputVisible: false,
      // 文本框中输入的内容
      inputValue: '',
    }
  },
  created() {
    this.getCateList()
  },
  computed: {
    // 如果按钮需要被禁用，则返回ture，否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的Id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName == 'many') {
        return '动态参数'
      }
      return '静态属性'
    },
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')

      if (res.meta.status !== 200) {
        return this.$message.error('获取父级分类数据失败！')
      }

      this.catelist = res.data
      //console.log(this.catelist)
    },
    // 级联选择框中项变化，会触发这个函数
    handleChange() {
      this.getParamsData()
    },
    // Tab点击事件的事件处理函数
    handleClick() {
      //console.log(this.activeName)
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length != 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      //证明选中的是三级分类
      //console.log(this.selectedCateKeys)
      // 根据所选分类的Id,和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: { sel: this.activeName },
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败！')
      }

      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })

      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    //监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },

    // 点击按钮，添加参数
    addParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName,
          }
        )
        //console.log(res.data)
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        }
        this.$message.success('添加参数成功！')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮，展示修改的对话框
    async showEditDialog(attr_id) {
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        {
          attr_sel: this.activeName,
        }
      )

      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败！')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 重置修改的对话框
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮，修改参数信息
    editParams() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName,
          }
        )
        //console.log(res.data)
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败！')
        }
        this.$message.success('修改参数成功！')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 根据Id删除对应的参数项
    async removeParams(attr_id) {
      this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning',
      })
        .then(async () => {
          const { data: res } = await this.$http.delete(
            `categories/${this.cateId}/attributes/${attr_id}`
          )
          //console.log(res.data)
          if (res.meta.status !== 200) {
            return this.$message.error('删除参数失败！')
          }
          this.$message({
            type: 'success',
            message: '删除成功!',
          })
          this.getParamsData()
        })
        .catch(() => {
          this.$message({
            type: 'info',
            message: '已取消删除',
          })
        })
    },
    // 文本框失去焦点，或回车了都会触发
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有return,则证明输入的内容，需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputVisible = false
      row.inputValue = ''
      // 需要发起请求，保存这次操作
      this.saveAttrVals(row)
    },
    // 将对 attr_vals 的操作，保存到数据库
    async saveAttrVals(row) {
      // 需要发起请求，保存这次操作
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' '),
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败！')
      }
      this.$message.success('修改参数项成功！')
    },
    // 点击按钮，展示文本框输入
    showInput(row) {
      row.inputVisible = true
      // 让文本框自动获取焦点
      // $nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick((_) => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应的参数可选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    },
  },
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>
